Sucker-rod elevator.



W. L. FOSTER.

SUCKEB ROD ELVATOR.

APPUCATION FILED FEB. 13. um.

1,285,10%.= Patented Nov. 19,1918.

Witnes Envenir v. M

WALTER L. rosrnn, or wnrrrinn, CALIFORNIA.

SUCKER-ROD ELEVATOR.

Specification of Letters Patent.

Patented Nov. 19, 1918.

Application filed February 13, 1917. Serial No. 148,404.

To all whom it may concern:

Be it known that I, WALTER L. Fosrne, a citizen of the United States of America, residing at Whittier, county of Los Angeles, State of California, have invented a certain new and useful Sucker-Rod Elevator; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved elevator for sucker rods of oil well pumps; and it may be said to consist in the provision of the novel and advantageous features, and in the novel and improved construction, arrangement, and combination of parts as will be apparent from the descrip tion and claims which follow hereinafter.

One object ,of the invention is to provide a novel and improved device for elevating pump rods, pipe, etc; which device comprises a shoe which is pivotally mounted on a hanger and is provided with a pivoted guard which bears against a cam surface on the hanger so that the guard is actuated to be disposed in operative position or inoperative position according to the position of the shoe, and whereby the guard is disposed in position to lock the pump rod or the like in the elevator, when the shank hangs unsupported.

Further objects of the invention are to provide a novel and improved device of the nature specified which is adapted to be easily and quickly applied to or disconnected from the rod or pipe, and which is convenient and safe to use, and effective in action.

Other objects and the advantages of the invention will be apparent to those skilled 'n the art from a careful consideration of the following description of the preferred construction embodying the invention, taken in connection with the accompanying drawings in which- Figure 1 is an elevational view of the device showing the guard in the inoperative position; Fig. 2 is a front elevational view of the device showing the guard in the operative position; Fig. 3 is a side elevational view of the device with the guard in the operative position; and Fig. 4 is a cross sectional view taken on the line 4-4 of Fig. 2.

Referring to the drawings, the hanger 10 has its lower part bifurcated to provide the spaced arms 11 and 12, and said hanger 10 has connected to its upper end the swivel eye 13.

The shoe 14 is provided with oppositely disposed pivots l5 and 16 which are ar ranged in bearings at the lower ,or free ends of the arms 11 and 12. The opening 17 in the shoe 14 is ,at an inclination to the arm 11 to facilitate placing the shoe on or disconnecting it from pump rods or pipes, and said shoe 14: is disposed on the pivots 15 and 16, so that when the shoe 14 is horizontal and the hangerlO is vertical the point of intersection 18 of a continuation of the axes of the pivots 15 and 16 and of the axis ofthe shank 19 of the hanger 10 is at the center of the inner part of the ,opening 17 The guard 20 is mounted on the pivot 21 in the recess 22 which is provided in the shoe l4, and said guard 20 is provided with a tailpiece 23 which has thereon the roller 24 adapted to contact with the cam surface 25 which is provided on the arm 12. A spring 26 is suitably connected to the shoe 14 and adapted to bear against the guard 20 so that the roller 24 is held in contact with the cam surface 25. It will be noticed that the cam surface has a depression 26 and a shoulder 27 which moves the roller 24: outwardly away from its center of revolution 16.

lVhen the shank 19 is disposed horizontally, that is, at right angles to the plane of the shoe, the roller 24 is in depression 26 and the guard 20 is withdrawn from the mouth of the opening 17. It will be seen that the shoe can be easily and quickly slipped over the rod. If the shank 19 is not supported it will drop by its own weight and roller 24 will ride upon shoulder 27 thereby moving the guard 20 across the mouth of opening 17 In elevators of the type disclosed herein, where there is no safety shoulder, the elevator when not supported by the line, -the hood of the supporting line being often removedwill slip from the rod releasing same. As it is usual to place the elevator on the rod and then hook to the line, the elevator must be maintained in supported position while the hook is not attached, otherwise the elevator slips from the rod releasing it. My elevator does away with this trouble.

When the hanger 10 is raised to the upright position by means of suitable hoisting apparatus connected to the swivel eye 13, the shoe 1%; is turned to a horizontal position and the part '29 of the sucker rod 28 rests on the upper part of the shoe l t, and the center of gravity of the sucker rod 28 is substan tially in line with the point 18. VJhile the hanger 10 is being hoisted to the vertical position with the sucker rod Q8 in the opening 1'7, the shoe 1% is turned on the pivots and 16 and the roller 24- travels on the cam surface so that the guard v is moved and held in the operative position in which it extends into the opening 1Tsee Figs. 2, 3, and a and is adapted to keep the sucker rod 28 in place in said opening 17.

LC'he construction which has been particularly illustrated and described adinits of minor changes and niodiiications-wherefore the right is reserved to all such changes and modifications as do not depart from the spirit and scope of the invention which is defined in the appended claims.

1 ciaiinz 1. A device of the nature specified, cornprising the combination of a hanger pro vided with a cam surface thereon; a shoe pivotaily mounted on said hanger and pro vided With a recess; and a guard pivotally this patent maybe obtained for Euro cents each,

mounted in said recess, said guard having a part thereon in contact with said cam surface, said cam surface having a contour to hold said guard in closed position hen said hanger is upright, a depression to hold said guard in open position when said hanger is horizontal, and an elevation to hold said guard in closed position When said hanger is below the horizontal.

2. A device prising the combination of a hanger provided with a cam surface thereon; a shoe pivotally mounted on said hanger and provided With a recess; a spring pressed guard pivotally mounted in said recess, said guard being provided with a tailpiece; and a roller on said tailpiece in contact With said cani surface, said cam surface having a contour to hold said guard in closed position when said hanger is upright, a depression to hold said guard in closed position When said hanger is horizontal, and an elevation to hold said guard in closed position When said hanger is below the horizontal.

in testimony whereof I have signed my name to this specification at Los Angeles, county of Los Angeles, State of California, this (3th day of February, A. D. 1917.

WALTER L. FOSTER.

"my addressi he Commissioner or latents,

IE. it

of the nature specified, coin- 

